how can I list-initialize my own class?

Question

I want my own class can be list-initialized like vector:

myClass a = {1, 2, 3};

How can I do that using C++11 capabilities?

Answer 1

C++11 has a notion of initializer lists. To use it, add a constructor which accepts a single argument of type std::initializer_list<T>. Example:

#include <vector>
#include <initializer_list>
#include <iostream>
struct S
{
  std::vector<int> v_;
  S(std::initializer_list<int> l)
    : v_(l)
  {
    std::cout << "constructed with initializer list of length " << l.size();
  }
};

int main()
{
    S s = { 1, 2, 3 };
    return 0;
}